Annual report pursuant to Section 13 and 15(d)

Weighted Average Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Cost (Detail)

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Weighted Average Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Cost (Detail) - United States Pension Plan of US Entity
 12 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2013
Assumptions for benefit obligations:      
Discount rate 4.45% 4.15% 4.90%
Assumptions for net periodic benefit cost:      
Discount rate 4.15% 4.90% 3.90%
Expected return on plan assets 7.50% 7.65% 7.75%